Dental matrix clamp



Dec. 11, 1923. 1,476,975

J. W. IVORY DENTAL MATRIX CLAMP 'Filed May 51 1921 ATTORNEYS Patented Dec. 1l, 1923.

JAMES W. IVORY, OF PHILADELPHIA, PENNSYLVANIA.

DENTAL MATRIX CLAMP.

Application filed May 31, 1921. Serial No. 473,576.

To all whom t may con/cern.'

Be it known that I, JAMES W. IVORY, a subject of the King of Great Britain, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Dental Matrix Clamp, of which the following is a specification.

My invention consists of a dental matrix retainer, the same embodying novel means for closing the matrix and retaining it firmly on a tooth, and details of mechanism as will be hereinafter described.

The invention is satisfactorily illustrated in the accompanying drawing, but the important instrumentalities thereof may be varied, and so it is to be understood that the invention is not limited to the specific details shown and described, as long as they are within the spirit or scope of the claims.

Figure l represents a perspective view of a dental matrix retainer embodying my invention.

Figure 2 represents a longitudinal section thereof.

Figure 3 represents a longitudinal sectional view of a portion on an enlarged scale.

Figures 4 and 5 represent longitudinal sections of portions of modified forms.

Figures 6 and 7 represent perspective views of a matrix and connections on an enlarged scale.

Figure 8 represents a side elevation of another embodiment of the invention.

Similar numerals yof reference indicate corresponding parts in the figures.

Referring to the drawing.

1 designates an arm which extends from the tubular stock 2 whose bore is screw threaded and receives thevscrew threaded slidable stem 3, the latter also passing through the interiorly threaded rotatable sleeve 4 which is swivelled on said stock 2 and is exteriorly milled for convenience of operating said sleeve. i

Connected with the stem 3 at the end 0pposite to its threaded portion are the re silient jaws 5 which are adapted to receive the terminal legs of the matrix 6, the latter thus being mountedv on said stem 3 as its carrier, the loop portion of the matrix being appliable to a tooth and adapted to embrace tightly the same, as known in the art.

Encircling said jaws 5 is the yoke 7 one side of which has fitted to it the screw 8 whose threaded shank 9 passes freely through the longitudinally7 extending slot 10 in the arm 1 so that in the motions of the stem 3, said screw may slide in said slot, it being noticed that when the screw is properly rotated it is adapted to cause the yoke 7 to close the jaws 5 and so clamp the legs of the matrix and cause a firm connection of the matrix with said jaws and consequently with the stem 3 On the outer end of the arm l is the angular plate 11 in which is the eye 1lX through which the adjacent portions of the legs of the matrix are passed and in which they may ride, during the closing operation of the matrix on the tooth, said plate being adapted to have a bearing on the contiguous portion of the matrix by a convex face for purposes hereinafter described.

To the outer end of the arm l adj acnt to the eye 11 is secured the tongue 12 which projects forward from said end as to engage with the outer side of the body of the matrix and bear firmly thereagainst, thus serving to cause the matrix to be pressed against the tooth and this with the closing motions of the matrix causes the latter to be held most firmly on the tooth, assisted by the bearing of the plate 11 against the contiguous portion of the matrix and acting as an abutment for the screw force.

In the embodiment shown in Figure 4, the tongue 12 is punched out of the material of the arm 1 and turned up therefrom without producing results different from what is shown in Figures 1, 2, and 3.

In the embodiment shown in Figure 5, the tongue 12 is an extension of the arm 1 beyond the plate 1l, and the latter is secured to said arm 1 while in Figures 1, 2, and 3, the plate 11 is an integral portion of said arm 1 and has a bearing aga-inst the tooth as has been stated.

In the embodiment shown in Figures 6 and 7, the matrix is adapted to be hooked upon the clevis 13, and the latter is adapted to be hooked upon the adjacent member 14 of the stem 3. Projecting from said member are the pins 15 which are adapted to pass through the slots 1G in the tubular body 17 which is employed in lieu of the arm 1 and adapted to abut against the shoulders 18 on the inner terminals of said slots to limit the motion of the stem 3 when the matrix is being opened ,by the operation of the sleeve 4. In said Figures 6 and 7 the tongue l2 and connected members have been omitted. f e

flihe terminal edge of the angular plate il has the corners ot the metal beveled off, leaving said terminal edge high in the eenter giving a eonvexity to this face so that as it rests against the contiguous portion of the matrix and the corners of this ilace do not impinge on the guinwvhether used Von the right or on the lett side ot the mouth. I have'spoken oi this plate as an abutment 'for the soi-ev7 torce as it rests against the band; l say further that it extends perpendicularly with the' tooth as it rests against the contiguous portion ofthe matrix on the buecal angle or corne?.` of the tooth extending into the V-spaee between the teeth and holds'the` relative portion ot the matrix against the Vsurface of the tooth as the ma* trix is tightened by thesereiv'tensionot' the retainer. The terminal end'` of the tongue 12 adjacent toV this platersts against the other side of the matrix on the outer corner or angle ofthe tace ot the tooth opposite to the other end of the band, just as the two y y legs of the matrix passes vinto the eye llX in the plate n1l. By this meehanieal eonstruction both ends *of the matrix meet to form almost a complete circle around the tooth, and are held by this tongue against the tooth on this side as the plate ll holds it on the other side as it passes'into the eye oi. the plate'll vso that the legs of the matrix maybe' clamped or otherwise held asthe matrix is drawn uniformly toits position on the" tooth 'which it eneireles, `whereby an operation oti'illingfa cavity of decay or talring xan'impressionoi any cavity on the crown surface ot a tooth may be performed and 'the interferencel ofY the occlusion of the teeth is notfliindered 'by this complete device Y In operating the tension nut-4 in the re- Verse direction the matrix is loosened on the tooth and hence may be readily removed either by loosening the screw 8 on the resilientl javvs or by lclipping the matrix band on the lingual side of the same.

Having thus described niyinvention what I claim asnew and ydesire to secure by Lettergflate11t,*is:- f

l. ln a dental matrix retainer, a movable carrier for the matrix, a supporting member for said carrier, and means for operating said carrier, and a tongue which is connected with said supporting member and adapted to engagetightly the. side, of the body of the matrix.

2li] a dental matrix retainer. u movable stem adapted to have the legs oi a matrix connected therewith, :i stoel; adapted to carry said stem, :n arm on .said steelt, und a tongue connected with said arm adapted to eiigage tightly the side ol the body of the matrix.

3. ln a dental matrix retainer1 a movable stem adaptei'l to have the. legs oi'V :i matrix clamped thereto and carried thereby. a :noch adapted to carry said sten. a iiui'lilie sleeve. i adapted to movey said stein and eonse quently the matrix. an :.rni on said stoet'. an eye plate on said arm. the legs ol' the matrix being adapted to pass freely through said eye plate. said arm having therein a rlongitudinally extending slot in which ii...

freely received the screiv oi the clamp oi" the matrix onsaid stem.

4. In a dental matrix retainer. a plate having an eye therein for the. passage ol the leg ot a matrix therethrough, said plate having the terminal edge convex so that its. centre may rest against the contiguous portion of the matrix and a tongue carried by said plate and acting to press the matrix7 against the action ot said plate.. against the, tooth.

In a dental matrix retainer. :i movable member, the latter having a plaie adapted to have the matrix engaged therewith. a Carrier tor said member. and a. plate on said member having therein an eve adapted to have the leg of a matrix passed there through for closing the latter. said plate being connected with said holder. and a lip on said member entering.: said holder and a resilient tongue to thrust against the side of the matrix to press the latter against the tooth.v

6. ln a dental matrix retainer`r zi. movable neinber, the letter being adapted to have the matrix engaged therewith. a holder l'or said member7 and a stop on said member movable'therewith adapted to abut a shoulder on said holder to limit the motion ot said member in closing thel body ot the matrix.

' JAMES lV. lVOllY.

Vitnesses JOHN A. lVinnnnsi ini in, N. BUssiNonn.

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